Hardness testing machine



April 18, 1939. G REICHERTER 2,154,323

I HARDNESS TESTING MACHINE Filed Jan. 15, 1957 3 Sheets-Sheet l Unrenfar:

April 18, 1939. G. REICHERTER 2,154,823

HARDNESS TESTING MACHINE Filed Jan. .15, 1937 s Sheets-Sheet 2 Dayan/Z April 18, 1939. G. REICHERTER HARDNESS TESTING MACHINE Filed Jan. 15 1957 3 Sheets-Sheet 3* Jnrenfor: %/m

Patented Apr. 18, 1939 4 I UNITED STATES PATENT OFFICE.

minimise 'res'rine Georg Beioherter, Ealingen-onvthe-Noehr,

' Germany lication Jammie, 1931, Serial No. 120.764

- In GermanyJanuary 21, 1936 r 1 v 3 Claim.

This invention relates to improvements in hardness testing machines in which the impressions produced by an intruding body .in a sample of the material to be tested are measured by microscope attached to the machine.

In the hitherto known machines of this kind the test load is transferred by a charge lever,-

mond' The microscope is fixed in a bracket linked either to the front wall of the upper part so as to rotate about a horizontal axis or linked to a side wall of the chine frame so as to rotate about a vertical For twting, the micro scope is byturning the bracket conducted over the impression to be tested, i. e. into the line of action of the intruding body.

These known hardness testing machines present the drawback that the rotation of the microscom can only be effected after the sample has been lowered to a degree corresponding at least to the height of the microscope, that is to say after the supporting table has been displaced to a con-: siderable degree.

By displacing the supporting table before each measurement the testing operation is made troublesome and lengt more'partioularly as after the rotation of the microscope-tor the pur= pose of coarse adjustment-the supporting table must be displaced anew and o ai terwards the exactadiustment can he eflected at the micro= scope itselfo A further drawback of the known hardness testing machines consists therein that in cases, in which dining the production of a testing im pressicn the samnle must be jammed between the supporting table and an abutment of the ma chine the sample must be released'beiore the ginning oi the mentin order to be able bring the microsoogze between the hair-using body and This often results es pecially in the case of long samples extending over the supporting se le, in the sample by s take being displaced out of its original a when the supporting tehle'is displaced, who y the testing impression is removed out of field or vision oi the microscope. Consequentlythe sample must he retumed into its prior position with great loss of time and then must held by hand on the supporting table during the whole measuring operation, that is during the coarse and line adjustment and during reading oi! thescale. The measuring of the testing impression is hereby extraordinarily impeded and the result of the measurement is often inexact.

The object of thepresent invention is to do away with these drawbacks by providing a hardness testing machine in which the testing impression can be measured at once after it has been made without the necessity of previous y displacing the supporting table or releasing the m gale, 3b

object is o tained according to the invention by making the carrier 01' the intruding body rotatable or crosswise displaceable whereby one is able to dispose the microscope from the heginningin the line of action of the test-pressure. a

The invention is illustrated by way of example in theannexed drawings of which Fig. l is a front elevation-of the testing machine;

Fig. 2 is a longitudinal cross-section on the line 1-1 of Fig. l, the intruding body being tive position.

Fig.- 3 is a longitudinal cross-section on the line 1-41-05 Figl, the intruding body being turned out of its line of action.

In the drags l is the frame of a hardness testing machine in the lower part 2 oi which a screw spindle 3 is journaled in the well-known manner, which spindle carries at its top end a supporting table :3 for the sample 5 and may be adjusted as to height by a hand wheel t. l is an intruding hody (steel hall, diamond or the like} which is fastened in a U-shaped or similar in opera bifurcated melnher 8. The legs 9, l0 are provided a hearings it, ill of the draw-rod it: by springs lil, l9 attached to the upper part oi the machine a frame and preferably engaging the rear-side of the mensher 8. X

To the ends or" the legs is stays El are linked which are rotatable about a horizontal axis 28 and the outer ends of which .form kniie-edges The stays 2i engage with these edges bearings 22 of a link 23 which is l4, ii of the draw-rod 7 journaled coaxially with the axis 23 of the stay 2| at the side walls of the machine-frame.

An abutment 24 serves for limiting the swinging motion of the link 23. The abutment is guided in a circular slot 25 of the upper part of the machine and may be flx'ed in this slot in any desired position. i

At the rear side of the member 8 a cam 21 of triangular cross-section is provided on each of the legs 9, III. This cam slides on corresponding displacement of the link with its upper side face 23 along the upwards slanting wedge face 23 of an abutment attached to the machine frame and thereby the cam turns the member 8 out of its operation position forwards.

On swinging the member! back into its operative position a buifer 3| resiliently attached to the machine frame serves as an abutment. Between the legs 9, III of the member 3 a microscope 32 is disposed in the frame coaxially to the line of action of the intruding body I. This microscope may be displaced by means of micrometric screws or the like upwards and sideways.

For testing the hardness of a material, the sample 5 is placed upon the supporting table 3 and, if required, pressed by means of the screw spindle 3 against the abutment 33 of the upper part of the machine. From the position shown in Fig. 3 now the link 23 is swung by means of the handle 34 attached thereto to such an extent that the member 8 is in vertical position above the sample 5. This takes place as soon as the link 23 coincides with the draw-rod It. Now when the link 23 is farther swung, for instance, into the position shown in Fig. 2, the force of tension exerted by the weight l'l or a spring on-the draw-rod I8 is distributed over the" stay 2| and the member 3. The latter presses the intruding body with-the force apportioned to it into the sample.

Now when the link 23 is swung a position below the draw-rod I6 is drawn upwards. It slides hereby with the upper face 28 of the cam 21 along the slanting wedge face 29 of the abutment 33 upwards up to an abutment 3! of the machine frame and at the same machine, the combination of a microscope, a body adapted to intrude into a sample of the material to be tested, a U-shaped member carrying on its crossbar the intruding body and being adapted to it swung into and to be removed out of 'the field of vision of themicrosoope, the latter being back again, .the member 3 as soon as the link has reached arranged between the legs of the said .U'-shaped member; springs attached to the upper part of the machine frame and to the backside of the said member,'a bifurcated drawrod drawn downwards by a suitable force, bearings formed at the free ends of the drawrod, the .i'ree ends of the said U-shaped member being held by the said springs in the said bearings of the said drawrod, a stay rotatable about a horizontal axis linked to the upper end of the said drawrod, and a lever connected with the said stay and coaxially linked to the machine frame.

2. In a statically acting hardness testing machine, the combination of a microscope, a body adapted to intrude into a sample of the material to be tested, a U-shaped member carrying on its crossbar the intruding body and being adapted to be swung into and to be removed out of the field of vision of the microscope, the latter being arranged between the legs of the said U- shaped member; springs attached to the upper part of the machine frame and to the backside of the said member, a bifurcated draw-rod linked to the frame of the machine and drawn downwards by a suitable force, bearings formed at the free ends of the draw-rod, the free ends of the said U-shaped member being held by the said springs in the said bearings of the drawrod, a stay rotatable about a horizontal axis linked to the upper end of the said draw-rod,

'and a lever connected with the said stay and coaxially linked to the machine frame, the swinging movement of the lever being limited by an abutment guided in a circular slot of the upper part of the machine frame and capable of being fixed therein.

3. In a staticallyacting hardness testing machine, the combination of a microscope, a body adapted to intrude into a sample of the material to be tested, a U-shaped member carrying on its crossbar the intruding body and being adapted to be swung into and to be removed out of the field of vision of the microscope, the latter being arranged between the legs ofthe said U- shaped member; springs attached to the upper part of the machine frame and to the backside of the said member, a bifurcated draw-rod linked to the frame of the machine and drawn downwards by a suitable force, bearingsformed at the free ends of the draw-rod, the free ends of the said U-shaped member being held by the said the upper end of the said draw-rod, a lever connected with the said stay and coaxially linked to the machine frame, cams of triangular section at the backside of the U-shaped member, a slanting wedge face on the machine frame cooperating with said cams, and an abutment attached to the machine frame to confine the movement of the U-shaped member.

onoaa momma. 

